I would swap the Goblins with bows for orc trackers, they cost the same, are in the Mordor list and shoot better. Of course unless you plan to fight a lot with your archers, you will be better off with armour.
I don't have the Mordor book OR the Moria & Angmar, so I don't know the cost of Morannon Captains/Shamans, and I don't know if the orc/goblin captain/shaman cost has changed.
SO:
The Morannon Banner must be moved to Warband 1.
To solve the problem with warband 2, you could do one of following:
1) Swap goblins w/ bows for Orc Trackers
2) Assuming the Morannon Shaman costs the same as an Orc Shaman in the One Rulebook, swap the Morannon Shaman to a Goblin Shaman and take another goblin with bow.
3) Swap goblins with bows for Mordor Orcs with bows, and then either drop Groblog for a 10 pts cheaper hero OR remove two goblins from the third warband.
I'd probably go for the second option, but then again, I've never played Moria
Hope it helps